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Gridded (1km and 5km resolution) Standardised Precipitation-Evapotranspiration Index (SPEI) data for Great Britain, published by the Environmental Information Data Centre. SPEI is a drought index based on the Climatic Water Balance (precipitation minus evapotranspiration) over a given accumulation period, following the method of Vicente-Serrano et al. (2010). The index is calculated for accumulation periods of 1, 3, 6, 12, 18 and 24 months, each computed separately for every calendar month, meaning monthly and longer-period time series may show autocorrelation. The generalised logistic distribution was fitted using the 1961-2010 standard period, and the dataset covers 1961 to 2012.1km and 5km gridded Standardised Precipitation-Evapotranspiration Index (SPEI) data for Great Britain, which is a drought index based on the probability of Climatic Water Balance (CWB) - which is equivalent to the amount of precipitation minus the amount of evapotranspiration - for a given accumulation period as defined by Vicente Serrano et al. (2010). SPEI is calculated for different accumulation periods: 1, 3, 6, 12, 18, 24 months. Each of these is in turn calculated for each of the twelve calendar months. Note that values in monthly (and for longer accumulation periods also annual) time series of the data therefore are likely to be autocorrelated. The standard period which was used to fit the generalised logistic distribution is 1961-2010. The dataset covers the period from 1961 to 2012. Full details about this dataset can be found at https://doi.org/10.5285/d201a2af-568e-4195-bf02-961fb6954c72.